Malicious PDF — malware analysis report

Static analysis result for SHA-256 80673dcf6054d019…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 16:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7b0cda828d6c3059c5b5027a3bee959 SHA-1: 645cb0e08dee954b69905fee7ecbff602bf2aba6 SHA-256: 80673dcf6054d01925de3acd70f560229bb6b60ab3dcc06e94124e9f1ea3e32c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads. The high ML score and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=galeria+pro+apk PDF link annotation
    • http://vitanova-cattery.com/upload/file/4733515283.pdfIn PDF document text
    • http://air-ned.com/uploads/files/1988786509.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/jakopatelebu.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/tozuminikurusudetovawagot.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/gotaxugukivabaretagi.pdfIn PDF document text
    • https://clove7.com/userfiles/file/mazexepigolixakodomopazed.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/zexajuxos.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210905095924.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/lizivolenitexasewudu.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/xelonuwepovapativupa.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/41257197433.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137baf1875e8---wifakife.pdfIn PDF document text
    • https://kultmotor.hu/images/files/57548510818.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/mixatojarodowanu.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/wosokafuzimopubenagaso.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc52a24b0---22275294521.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/jafekopukuvikoturatu.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/mirebixoroferozalifafiwe.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/nufaniw.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/50032622224.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/fawiwaveso.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/5656055242.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/xarudolilofisolanamovavot.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/48983115667.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/kipatokikofiga.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/koziv.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/37513901144.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC277 19124 bytes
SHA-256: 4892f708efc27bdfbf483e615ab85ec24ad0db5b1fae49358836d06e1d36b87b
font_01_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10004 bytes
SHA-256: 88217d6314f038b56536943ff715e8b6f4caaff89e8f0ffd5a29670990326368
font_02_sfnt_off0001095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1